Discord OAuth returns invalid_client no description error

I am attempting to integrate with Discord's OAuth. So far I have;

1. Created a Discord app and added my Appwrite's project redirect URI
2. I enabled Discord OAuth in Appwrite Auth and provided the App ID and App Secret
3. When I attempt to call the createOAuth2Session it works in the sense that I reach the Discord OAuth confirmation page and I click Authorise
4. Once I get redirected back to my app (http://localhost:3000), I get the following error:

{"message":"Failed to obtain access token. The Discord OAuth2 provider returned an error: invalid_client: No description","type":"user_oauth2_unauthorized","code":401}

I'm not sure I understand where the problem seems to be and invalid_client lacking description makes it harder to debug.

A side effect I noticed on the Appwrite Cloud platform is that when I try to "Edit" the Discord OAuth2 settings in the modal, the App ID flickers for a second and the input field assumes my Appwrite Cloud email instead of the supplied App ID.